| abstract |
The object of the present invention is to provide the following technology, that is, in a battery packaging material including a film-like laminate in which at least a base layer, an adhesive layer, a metal layer, and a sealing layer are laminated in this order, the base layer Since the polyester film is included, the electrolytic solution resistance is further improved, and cracks and pinholes are less likely to occur during molding of the base material layer including the polyester film, and have excellent formability. The solution of the present invention is to provide a packaging material for batteries, which includes a laminated body in which at least a substrate layer, an adhesive layer, a metal layer, and a sealing layer are sequentially laminated, the above-mentioned substrate layer includes a polyester film, and the above-mentioned The metal layer is an aluminum foil having a 0.2% yield strength of 55 to 140 N/mm 2 when subjected to a tensile test in a direction parallel to the rolling direction. |